According to soon-to-be-published research from professors at Columbia University and the University of Pittsburgh, browsing Facebook lowers our self control. The effect is most pronounced with people whose Facebook networks were made up of close friends, the researchers say.

Most of us present an enhanced image of ourselves on Facebook. This positive image—and the encouragement we get, in the form of “likes”—boosts our self-esteem. And when we have an inflated sense of self, we tend to exhibit poor self-control. …

People who spent more time online and who had a high percentage of close ties in their network were more likely to engage in binge eating and to have a greater body mass index, as well as to have more credit-card debt and a lower credit score, the research found. Another study found that people who browsed Facebook for five minutes and had strong network ties were more likely to choose a chocolate-chip cookie than a granola bar as a snack.